7542738409 has 2 divisors, whose sum is σ = 7542738410. Its totient is φ = 7542738408.

The previous prime is 7542738391. The next prime is 7542738451. The reversal of 7542738409 is 9048372457.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4961793600 + 2580944809 = 70440^2 + 50803^2 .

It is a cyclic number.

It is not a de Polignac number, because 7542738409 - 2¹¹ = 7542736361 is a prime.

It is a super-3 number, since 3×7542738409³ (a number of 31 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (7542798409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3771369204 + 3771369205.

It is an arithmetic number, because the mean of its divisors is an integer number (3771369205).

Almost surely, 2^7542738409 is an apocalyptic number.

It is an amenable number.

7542738409 is a deficient number, since it is larger than the sum of its proper divisors (1).

7542738409 is an equidigital number, since it uses as much as digits as its factorization.

7542738409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1693440, while the sum is 49.

The square root of 7542738409 is about 86848.9401720021. The cubic root of 7542738409 is about 1961.1448962298.

The spelling of 7542738409 in words is "seven billion, five hundred forty-two million, seven hundred thirty-eight thousand, four hundred nine".